Another style that is often presented as being antique is the dirk or sgian made primarily with colored stones like agate, held together with silver. I wonder how early these really became popular.

It does seem like weapons have been the most common motif.

The "miracle" brand pins are also interesting, although I think they are more mid-20th century.

The designs you show above are really attractive, much better than the pewter and plastic things I often see proliferating at Highland Games and Ren Faires.